The String class provides another method called subSequence which acts similar to the substring method. (Doesn't in your example, but could in other cases.) Substring in Java. String substring() method variants Updated in 2021 There are two variants of this method. While it's a simple and common task, the method names often differ between programming languages. As we have two loops and also String’s substring method has a time complexity of o(n) If you want to find all distinct substrings of String,then use HashSet to remove duplicates. Your "indexOf" example should use >= 0, not > 0, since 0 is valid if the substring occurs at the beginning of the string. Added this response since people are obviously still searching and finding this answer. Java String substring() method is used to get the substring of a given string based on the passed indexes. Find occurrences of substring in a string in Java In this post, we will see how to find the number of occurrences of one String in another String in Java. String str = "Apples are red"; String substr = "are"; int n1 = str.length(); int n2 = substr.length(); System.out.println("String: " + str); System.out.println("Substring: " + substr); Then a for loop is used to find if the substring is a part of the given string or not. It returns a boolean value true if the specified characters are substring of a given string and returns false otherwise. A part of string is called substring. In other words, substring is a subset of another string. This method has two variants and returns a new string that is a substring of this string. Java String contains() method. How to get a substring from String in Java? Java String class provides two versions of substring method to get a substring from the String as given below. Method substring() returns a new string that is a substring of given string. Above solution is of o(n^3) time complexity. The only difference is that it returns a CharSequence instead of a String and it can only be used with a specific start and end index: assertEquals("USA (United States of America)", text.subSequence(67, text.length() - 1)); 4. In case of substring startIndex is inclusive and endIndex is exclusive. A null or a string input should returns 0. Check if a String Contains a Substring in Java. Find Matching Substring: In This Post, we are trying to learn the different ways to Find Matching Substring of an inputted string in Java. String.contains() – Case Sensitive Java String substring example shows how to get a substring from String in Java. Please go through Frequently asked java … The Java String contains() method is used to check whether the specific set of characters are part of the given string or not. For example, here is a small sample of the methods used to achieve this in various languages: * Java: String.contains(), String.indexOf(), etc. Syntax. You can get substring from the given string object by one of the two methods: Here is the syntax of this method − public String substring(int beginIndex, int endIndex) It can be directly used inside the if statement. In Java, we can use String.contains() to check if a String contains a substring.. 1. The substring begins with the character at the specified index and extends to the end of this string or up to endIndex – 1, if the second argument is given. In this guide, we will see how to use this method with the help of examples. A common operation in many programming languages is to check if a string contains another string. Note: Index starts from 0. The example also shows how to find substring in a string and then get a substring. 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